'\" t
.\"     Title: DROP CAST
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 2011-12-01
.\"    Manual: PostgreSQL 9.1.2 Documentation
.\"    Source: PostgreSQL 9.1.2
.\"  Language: English
.\"
.TH "DROP CAST" "7" "2011-12-01" "PostgreSQL 9.1.2" "PostgreSQL 9.1.2 Documentation"
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.SH "NAME"
DROP_CAST \- remove a cast
.\" DROP CAST
.SH "SYNOPSIS"
.sp
.nf
DROP CAST [ IF EXISTS ] (\fIsource_type\fR AS \fItarget_type\fR) [ CASCADE | RESTRICT ]
.fi
.SH "DESCRIPTION"
.PP

DROP CAST
removes a previously defined cast\&.
.PP
To be able to drop a cast, you must own the source or the target data type\&. These are the same privileges that are required to create a cast\&.
.SH "PARAMETERS"
.PP
IF EXISTS
.RS 4
Do not throw an error if the cast does not exist\&. A notice is issued in this case\&.
.RE
.PP
\fIsource_type\fR
.RS 4
The name of the source data type of the cast\&.
.RE
.PP
\fItarget_type\fR
.RS 4
The name of the target data type of the cast\&.
.RE
.PP
CASCADE, RESTRICT
.RS 4
These key words do not have any effect, since there are no dependencies on casts\&.
.RE
.SH "EXAMPLES"
.PP
To drop the cast from type
text
to type
int:
.sp
.if n \{\
.RS 4
.\}
.nf
DROP CAST (text AS int);
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
The
DROP CAST
command conforms to the SQL standard\&.
.SH "SEE ALSO"
CREATE CAST (\fBCREATE_CAST\fR(7))
